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Valery A. Danilack, MPH, PhD; Osarenoma Okunbor, BA; R. Richardson, MD; Merilee Teylan, MPH;

Performance of a pedometer to measure physical activity in a U.S. cohort with chronic obstructive pulmonary disease. Valery A. Danilack, MPH, PhD; Osarenoma Okunbor, BA; R. Richardson, MD; Merilee Teylan, MPH; Marilyn L. Moy, MD, MSc. Aim

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Valery A. Danilack, MPH, PhD; Osarenoma Okunbor, BA; R. Richardson, MD; Merilee Teylan, MPH;

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  1. Performance of a pedometer to measure physical activity in a U.S. cohort with chronic obstructive pulmonary disease Valery A. Danilack, MPH, PhD; Osarenoma Okunbor, BA; R. Richardson, MD; Merilee Teylan, MPH; Marilyn L. Moy, MD, MSc

  2. Aim • To assess (1) the Omron HJ-720ITC pedometer’s accuracy in detecting continuous steps in the clinic, (2) the percentage of steps walked in the community that are continuous, (3) the ability of the Omron to detect differences in daily step count observed between weekdays and weekend days, and (4) the number of monitoring days needed for optimum reliability. • Relevance • Persons with chronic obstructive pulmonary disease (COPD) are significantly less active than healthy persons. Objective assessment of physical activity (PA) in COPD is important.

  3. Method • Sample of 176 persons with stable COPD wore Omron and StepWatch Activity Monitor (SAM) in the clinic and community for 14 d. • Omron uses 4 s step filter to screen out erroneous intermittent steps. • SAM captures all intermittent and continuous steps walked. • Omron steps were compared with manually counted steps in clinic and with SAM steps in community. • Calculated intraclass correlation coefficient for first 2 d, first 3 d, etc., up to 14 d.

  4. Results • Omron registered ≥90% of manually counted steps from in-clinic walk in 155 of 176 subjects. • In community, 47 ± 16% of SAM steps were continuous ones that were captured by Omron.

  5. Conclusion • For the Omron and the SAM, at least 7 d of monitoring should be used to capture decreases in PA on weekend days and obtain optimum reliability for all Global Initiative for Chronic Obstructive Lung Disease stages. The Omron accurately and reliably measures continuous walking in COPD. The Omron may be ideal for use in PA interventions that promote continuous walking as exercise.

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